Dental instrument



Aug. 19 1924. 1,505,684

F. A. AINSWORTH DENTAL INSTRUMENT Filed 001:. 13. 1925 Patented Aug. 19, 1924.

UNETED STATES PATENT .oF

FRANCIS ASKEY AINSWORTH, OF ST. JOHN, NEW BRULTSWICK, CANADA.

DENTAL INSTRUMENT.

Application filed mm 13, 1923. serial m ssages.

To all whom it may concern:

Be it known that I, FRANCIS AsKnY AlNS won'rn, a subject of the King of Great Brit,- ain, and resident of St. John, in the Province of New Brunswick, Dominion of. can, ada, have invented certaln new and useful Improvements in Dental Instruments, of WlllCll the followlng IS a specification. This invention relates to dental 1nstr,u-'

ments and more especially to instruments de signed to be used as holders and compressors for the placing of synthetic porcelain fill ings.

Further objects are to provide an in'i-- proved holder and compressor, which is connected to a detachable handle so that several sizes of holders may be provided, while only one handle is sold for every set. 1 7,

Further objects of the invention are to facilitate the handling of synthetic porcelain in gingival and labial cavities by pro viding an instrument to hold the celluloid strip against the filling instead ofusing the fingers as is done at present. 1 i i It is well known that a strip of celluloid is used in the insertion of these synthetic fillings, as this material does not affect the porcelain while hardening, and the celluloid strips may be made of such forms as to roughly fit the size of the tooth that is' to be filled.

The celluloid form is placed over the synthetic porcelain, and pressed on it by means of an improved holder until the porcelain is hardened. The object of the celluloid strip is also to protect the porcelain from the moisture of the atmosphere, whichis important until the porcelain is thoroughly set.

Still further objects are to provide a holder which is formed with a hole, through which wax may be run to hold the complete manufactured celluloid tooth face form securely when a whole surface of tooth is to be restored or a bridge facing restoration is being made, so that the metal flange will not come in contact with the porcelain filling at the incisa-l end of the tooth.

Still further objects are to provide an improved dental instrument, that is simple in construction, not liable to go out ofrepair, and generally to adapt the several parts to better perform the functions required of them. I

With the above and other objects in view, the invention consists essentially of an instrument for pressing thin celluloid over synthetic porcelain in the cavity of a tooth instead of holding and pressing the celluloid with the fingers and is particularly adaptable for use for dealing with V the gingival and labial cavities in the anterior teeth.

In thedrawings: I Figure 1 is a perspective view of the device in use.

Figure 2 isa perspective view of thedevice itself. i

Figure 3 is a plan view; F igure 4 is a fragmentary detail view showing the holder itselfin'section.

Figure 5 is a fragmentary sectional view of the holder n use.

fIn'f'the drawings like characters of reference indicate corresponding parts in all the figures.

Referring to the drawings, A represents the dental instrument, which, comprises a,

holder 10, which roughly, has the shape of atooth, and is a concave element as clearly shown in Figures and 5 of the drawings. The member .lO'is f rmed integral with a flange ll provided at the edge designedto engage the incisal edge of the tooth.

The holder member 10 is provided with a hole 12in which dental waxmay be run as will be hereinafter set forth.

The member 10is formed integral with a shank 13 which has the form of a pen nib and is designed to be engaged by a detachable handle 14, which issimilar to a pen holder.

By meansof this arrangement, it will be seen that several sizes of holders'proper 10 may be provided, while onlyone handle 14 is adapted for eachgset of holders.

hen in. use, the strip of celluloid is placed in the holder in engagement with the flange 11 as shown in Figure 5, and by means of the holder, the strip of celluloid pressed against the synthetic porcelain The method for, inserting the synthetic porcelain filling in the gingival or labial cavities in the anterior teeth is to mount the strip of celluloid in the holder as shown in Figure 5, and trim the edge so as to'shape it to conform with the shape of the gum line ormargin with the scissors, soft porcelainis then properlyplaced in cavity and held in place while hardening with the celluloid in '110 theholder. above described.

The gumline ofteeth varies greatly, so that after acelluloid form isjtrimmed for one case, it is not likely to be suitable for it in V-shape so asto more readily enter the holder and flange.

An advantage of this isthat. the holder can be withdrawn leaving the celluloid in olace to protect from the moisture of the a atmosphere, which is important until the porcelain is thoroughly set."

The concave holder 10 is made of sufliciently resilient'metal so that when pressure is applied, it will cause the celluloid to conform to the surface of the tooth structure around the cavity.

The small perforation 12 in the member '10 is provided above the centre, so that dental sticking wax may be run through to hold the celluloid tooth face form securely when the whole surface of tooth is to be restored, or a bridge facing restoration made, so that the metal flange, will not come in contact With'the porcelain filling at the ,tip or. inoisal end of the tooth.-

tO extend beyond the cavities so as to con- As a rulethe celluloid strips are allowed above construction, and many apparentlywidely different embodiments of my invention, Within the scope of the claims, constructed without departing from the spirit or scope thereof, it is-intended that all matter contained in the accompanying specification and drawings, shall be interpreted as illustrative and not in a limiting sense.

lVhat I claim as my invention is: 1. A dental filling holder and compressor to be used in connection with celluloid strip as a facing form, comprising a concave holder, a flange formed integral with the lower end'of the holder designed to hold the celluloid around the inoisal edge of' the tooth, a shank extending from the holder, and a handle detachably engagingthe shank. 2. A. dental filling holder and compressor, comprising a concave holder, a flangeformed integral with the lower end of the holder, a shank extending from the holder, a handle detachably engaging the shank, the holder being formed with a hole, as and for the purpose described. p

In witness whereof I have hereunto set my hand in the presencejof two witnesses.

FRANCIS ASKEY AINSWORTH. 

